you only need to note 3 things.
1. The web design is very sketchy and the whitepaper is often copied from other projects.
2. Roadmap is also not detailed and clear, the direction is misleading and always aims to make the price pump strong.
3. Huge discount with the purchase at seed round, about 50% - 60%, it can be considered as a scam project.
You point out 3 most important matter. But I want to add some point with you..
a. Reputation of bounty manager. Before joining a campaign we should check the reputation of BM.
b. Visit project website and see the team members of the project and try to assess whether team members are real or fake.
c. Newly created social media. Most of the scam project's social media are newly created and lack of knowledge about the project.